Hey Dan, there arent too many of the holes that you can access from the inside to put silicone, etc. THe clips pull the trim very tight to the cab so Im not terribly worried about it, plus my truck only sees water when its being washed. Here are the links to the part numbers.
Clips
http://www.classicparts.com/1955-59-...ctinfo/62-825/
Trim
http://www.classicparts.com/1955-59-...ctinfo/62-122/
I do have some pics of the holes in the cab before I put the trim on. Light isnt good and they arent great but I will post them soon.